You will be searching high and low for NOS pieces, and even then will never find a matched set that looks integrated and more or less the same color. Many if not most pieces are not even available anymore. And finding anything that is NOS, is finding a needle in a haystack.
MUCH more highly recommended to get your set done by Madera or another firm that specializes in wood finishing. They will also make sure that the set is matched, and any pieces that need re-veneering can be done at this time.